Bioresource Technology, Vol.219, 762-767, 2016
Effect of filling fraction on the performance of sponge-based moving bed biofilm reactor
Cubic-shaped polyurethane sponges (15 x 15 x 15 mm) in the form of biofilm carriers were used in a moving bed biofilm reactor (MBBR) for treating synthetic domestic wastewater. Results indicated there was no significant difference in total organic carbon (TOC) and ammonia (NH4+-N) removal at different filling fractions. Three reactors exhibited high removal efficiencies of over 93% TOC and 95% NH4+-N on average at an HRT of 12 h and aeration flow of 0.09 m(3)/h. However, total nitrogen (TN) removal and simultaneous nitrification and denitrification (SND) increased with increasing the filling fraction. TN removal averaged at 77.2, 85.5% and 86.7% in 10%, 20% and 30% filling fraction reactor, respectively. Correspondingly, SND were 85.5 +/- 8.7%, 91.3 +/- 9.4% and 93.3 +/- 10.2%. Moreover, it was observed that sponge carriers in the 20% filling fraction reactor achieved the maximum biomass amount per gram sponge, followed by the 10% and 30% filling fraction reactors. (C) 2016 Elsevier Ltd. All rights reserved.